# Parquet / HDF5 placeholder
# Replace this file with the actual Parquet or HDF5 binary export of the dataset.
# Recommended tool: pandas df.to_parquet('data.parquet', engine='pyarrow', compression='snappy')
# Parquet is column-oriented; ideal for large datasets (>100 MB).
# HDF5: df.to_hdf('data.h5', key='df', mode='w')
